1. Size: DN150-1200.
2. Body: Cast iron. Ductile iron, Stainless steel, Cast steel
3. Disc: Ductil iron, Stainless steel, Al-Bronze
4. Stem: Stainless steel
5. Seat: NBR, EPDM, PTFE, VITON
6. Pressure Rate: PN10/16, Class 150
7. Spline is between the shaft and disc.
8. Strength more highly, seal more reliably for seat.
